Re: LYNX-DEV How to get DJGPP to make sounds

From:

Michael Sokolov

Subject:

Re: LYNX-DEV How to get DJGPP to make sounds

Date:

Fri, 14 Nov 1997 10:20:02 -0500 (EST)

You are using INT 7Ch. I have never heard of this interrupt service. It
certainly isn't provided by the standard ROM BIOS or MS-DOS. Is there some
sound driver spec that prescribes this interrupt as a standard way to make
sound? If yes, make sure you check the presence of the necessary driver before
you invoke the interrupt, since the INT 7Ch vector may be set to 0000:0000 and
in this case executing INT 7Ch would do exactly what it does for you (lock up
your system). The presence check mechanism should be documented in your spec.
If there is no spec, where have you got the INT 7Ch idea from?
Sincerely,
Michael Sokolov
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